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R. E. WEBER.

RESONANCE CHAMBER FOR ALKING' MACHINES.

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ROBERT 4E. WlEBER, OF MILWAUKEE, WISCONSIN.

RESONANCE-CHAMBEB FOR TALKING-MAGHIN F51.

Specification nf Letters Patent.

Patented Oct. 28, 1919.

Application lecl May 25, 1916. Serial No. 99,711.

To all 4it-tem it may com-ern:

Be it known that l', Ronnu'r E. Wanna.' a citizen of the United States.residingr at Mllwaukee, county of Milwaukee, and State of Wisconsin,have invented new and useful Improvements in Resonance-Chambers for'1`alking-llacl1ines, o f which thc follouiincY is a specification.

My invention relates to improvements in resonance chambers for talkingmachines.

The object of my invention is to provide means for improving the tone,amplifying the sound volume, and eliminating discordant sounds, such,for example, as the scratching sound commonly attributed to the frictionof the. needle upon the surface of the record.

In the drawings- Figure 1 a vertical sectional view of a portion of atalking machine of the so called cabinet type equip ed with myinvention, said section being rawn to a plane cutting: tbe axis of thehorn,the machine illustrated being of that type in .which the horn isinclosed within the cabinet.

Fig. 2 is a front elevation .1 the resonance chamber.

Fig..3 is a vertical sectional view of the. front wall of a talkingmachine cabinet showing my invention applied thereto in modified formadapted to be used as an attachment to a previously constructed.cabinet.

Fig. 4 is a central longitudinal sectional view of my improved resonancechamber as illustrated in Fig. 3.

Fig. 5 is a front elevation of the same.. Li e parts are identified bythe same ref- .erence characters throughout the several views.

'lhe cabinet l. illustrated in Fig. l, s of ordina oonstmction, but thehorn 2 pref'- erably Yes wooden walls., spruce being;r preferred. Theouter or large end of the horn is formed to receive my improvedresonance chamber 3, the top and bottom walls of the with a bass bar 12,which, in the construction illustrated in Figs. 1 and 2. is located1nidway between two pairs of f holes 10 and extends transversely acrossthe front wall to points near its side margins. The bai' 12 taperedtoward its respective, ends and serves as a tone agent. A sound post 13may also he employe( to connect the hack )late 5 with the front plate orwall 7. It will be understood that the sound wares received in resonancechamber are utilized to set the front and rear walls of the chamber invibration in substantially the same, manner that the walls of a violinvibrate. The corners or angles formed at the junction of the Walls 5 andT with the side and end Walls, areprcferably filled in to presentrounded surfaces, as shown at 15. and the side and end 4walls arepreferably7 thick enough to provide a solid frzune. for the chamber andfacilitate connecting the same rigidlyr to the walls of the horn. Theouter surface ot the frame is iw'icangular and the walls of the horn arearranged to form a rectangular opening to receive the resonance chamber.

It will be understood by those familiar with this art that the body ofthe resonance chamber and the air contained therein beingA thus set invibration, communicates this vibration to the circumambicnt air. Thebody of the resonance chamber acting as a soundingr hoard reinforces allthe, notes within its compass, whereas discordant. sounds of minorcharacter will be neutralized or eliminated.

it is not essential that the resonance cham he -should be attacheddirectlv to or within the mouth ofthe horn. In Figs. 3 and 4, I haveillustrated a resonance chamber, which isllulrtienlarly adapted to beadjusted to or ra'rtiall)7 within the srund opening 17 of a so calledtalking machine cabinet. In this ease the chamber is secured directly tothe Walls of the cabinet at the margins of the sound opening andprojects outwardly 4for a short dis tance therefrom. The resonancechamber illustrated in Figs. 3 and 4 is also provided with a differentarrangement-of the f holes and a pair of bass bars or soundin bers 12are employed between the two f oles 10' illustrated. These soundin bars12" diverge in general conformity to t e divergence of the f holes. Thespecific arrangement of the f holes and bass bers is not essentiel to myinvention` these 'features being sublect to a number of variations; thecharacter of which will be vWell by those skilled in this art. Asymmetrical arrange-V ment is, however, desirable.

I elaimvl The combination with a talking machine 5 having n soundamplifying chamber pro vided with openings for the escape andadmissionof sound waves, of e resonance chamber disposed across said openingandhavin un inner wall provided with an open 10 ing a apted to freely admitsound waves to said chnmi'er, said opening in the resonance chamberbeinglergerfthan the sound admission opening of said amplifying chamber,and an outer vibratory. well extending directly of the sound waves, 15provided with relatively small openings on olnposite sides of thecenter, through which t e amplified sound waves may be projected.

In testimony whereof I affix my signature in the presence of twowitnesses.

ROBERT E. WEBER, Witnesses:

